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Multi body dynamic simulation of tyre traction trailer

International Centre For Automotive Tech.-Gopal Singh Rathore
  • Technical Paper
  • 2019-28-2430
To be published on 2019-11-21 by SAE International in United States
Tyre Traction Trailer is a device designed to find the Peak Brake co-efficient of C2 and C3 tyre as per ECE R117. The trailer is towed by the truck and is braked suddenly to evaluate braking co-efficient of specimen tyre. It is a single wheel trailer equipped with load cell to capture tire loads (Normal and longitudinal)while braking. Traction Trailer is modelled in MSC Adams and rigid body simulation is carried out for static stability of the system. Dynamic simulations were performed to understand locking of wheels during braking. Body frame was further modelled as flex body to perform structural analysis of the frame. The paper contains stress and deformation plots of trailer Structure under various loading conditions, change in Centre of gravity, weight transfer and forces on springs during braking and cornering, plots of tractive and normal load on tyre during braking.
 

Spring and damper tuning of an ATV to reducing transmissibility

ARAI Academy-Rajat Girish Kanade, Mohammad Rafiq Agrewale, Kamalkishore Vora
  • Technical Paper
  • 2019-28-2401
To be published on 2019-11-21 by SAE International in United States
The application in vehicle ride and handling has been mostly subjective or intuitive. There are several methods to improve vehicle stability and handling. One of the methods is suspension tuning. The objective of this work is to perform dynamical analysis of suspension by spring and damper tuning to reduce transmissibility for an all-terrain vehicle. A baseline spring rate data is used for tuning to provide better ride. The Fox air shock absorbers with progressive damping are used for testing. First the dynamics simulation is carried out by using ADAMS CAR tool. A detailed characteristic of the air shocks is obtained at various loading conditions by experimentation using test rig. Based on it, the simulation has been carried out for desired tuning parameters of spring and damper to improve stability. The speculated optimum setting is validated on an all-terrain vehicle (ATV) using ultrasonic sensors and accelerometers, by varying vehicle speed and bump heights to evaluate the transmissibility of the suspension. The acquired data shows behaviour of the suspension and the influence of the main parameters in…
 

Optimization of the critical parameters affecting the fuel lid performance

Maruti Suzuki India, Ltd.-PIYUSH KUMAR PAREEK
  • Technical Paper
  • 2019-28-2413
To be published on 2019-11-21 by SAE International in United States
Fuel lid is one of the parts which are mostly operated mechanically by the end user while filling the fuel. Therefore part design should be done in such a manner that it can be operated smoothly without any hassles. The conventional steel fuel filler doors are of two types: Three-piece type fuel filler doors also known as the dog-leg type and two-piece type fuel filler doors also known as the butterfly type. Both types of fuel filler doors have a pin that acts as a rotational hinge axis about which the fuel filler door opens and closes. Depending on the styling and shape of the side body outer, fuel lid type is decided. In the current study, dog-leg type fuel lid is considered. The factors that primarily affect the opening-closing performance are the weight of fuel lid, hinge axis, and the friction at the hinge area. The orientation of the hinge axis is derived from the profile of the side body outer panel. The fuel lid weight and hinge axis are decided in the initial…
 

Investigation of Transmissibility of an all-terrain vehicle with spring and damper tuning.

ARAI Academy-Rajat Girish Kanade, Mohammad Rafiq Agrewale, Kamalkishore Vora
  • Technical Paper
  • 2019-28-2423
To be published on 2019-11-21 by SAE International in United States
The application in ride and handling development has been mostly subjective or intuitive. Suspension settings are based on the opinions of experts. The product of this research will enable to quantify the performance of a suspension in terms of its ability to minimize the transmission of road irregularities to the chassis and achieve good mechanical grip with the road surface. This work presents a dynamical analysis of the transmissibility of an off-road vehicle suspension, developed in VIT Vellore for Baja SAE India competition. A baseline spring rates curve for ride is developed to provide a solid foundation to tune from. The shock absorbers used for testing are Fox Float Evol R air shock absorbers with progressive damping. A thorough data acquisition of the force curves for shocks from a test rig is done. A detailed characteristic of the air shocks is obtained at various loading conditions. The basic damping curve is modified towards the desired ideal nature with the data obtained. The speculated optimum setting is validated on the ATV vehicle with ultrasonic sensors and…
 

Feasibility of Multiple Piston Motion Control Approaches in a Free Piston Engine Generator

West Virginia University-Mehar Bade, Nigel Clark, Parviz Famouri, PriyaankaDevi Guggilapu
  • Technical Paper
  • 2019-01-2599
To be published on 2019-10-22 by SAE International in United States
The design optimization and control of Free Piston Linear Engine (FPLE) has been found to be difficult as each independent variable changes the dynamics with respect to time. These dynamics, in turn, alters the alternator and engine response to other governing variables. As a result, the FPLE system necessitates an energy balance control algorithm with high-speed dynamic response for stable operation and perhaps optimized system efficiency. The main objective of this control algorithm is to match the power generated by the engine to the power demanded by the alternator. This energy balance control is similar to the use of a governor to control the crankshaft rotational speed in a conventional crankshaft driven engine. In addition to that, when stiff springs are added to the FPLE system, the dynamics becomes more sinusoidal and more consistent with increasing spring stiffness. To understand the cycle-to-cycle variations, a comprehensive FPLE numerical model with a 1kW target electric power was developed in MATLAB®/Simulink. An FPLE system corresponding to that numerical model has been operated in the laboratory. In this numerical…
 

Design Optimization of Trunk Lid Torsion Bar Type Trunk Lid Pop Up Mechanism

Maruti Suzuki India, Ltd.-Sharath Chandra Kasarla, Amit Singh
  • Technical Paper
  • 2019-28-0111
To be published on 2019-10-11 by SAE International in United States
Trunk lid can be opened using hydraulic/pneumatic balancers, coil springs, torsion bars or combination of the above. Trunk Lid Opening Mechanism specific to Trunk Lid Torsion Bar (TLTB) is being discussed in the paper. After de-latching, trunk lid should open smoothly and stop at such a height that it is visible from driver seat. The system consists of a four bar linkage mechanism, in which the fixed link is formed by BIW Bracket. Connecting link, Trunk lid Hinge Arm and Torsion bar form the other three links. Hinge has its one end attached to trunk lid and the other end to BIW bracket. Torsion bar transfers torque to Trunk lid hinge through the connecting link. Major challenges in designing TLTB mechanism are part tolerances, C.G position and Weight variations in individual parts, Torsion bar Raw Material variation, uncertain friction in the system etc. If above challenges are not addressed properly, then issues like Trunk Lid not popping up to desired level consistently and smoothly and hard closing may occur. Trunk Lid pops up when torque…
 

Modeling and analysis of helical and wave spring behavior for automobile suspension

Sri Krishna College of Engg. and Tech.-Soundararajan Ranganathan, Sathishkumar Kuppuraj, Girish Vishnu Rajaram Ganesan, Jayasuriya Nandhagopal
  • Technical Paper
  • 2019-28-0130
To be published on 2019-10-11 by SAE International in United States
Suspension is an indispensable element of automobiles which plays a crucial role in maintaining stability and the ride comfort. Helical springs are used in automobile suspension for many decades. The stiffness of the spring and presence of shock absorber plays a major role while negotiating a huge amount of load. Therefore, the cost of the suspension increases proportionally in commercial vehicles. In this present work a helical and wave spring is designed and static cum dynamic analysis is done by using ANSYS for comparing their performance and to eliminate the downside of the suspension. The geometry of the helical spring is designed using helix curve and wave spring is designed using Sinusoidal equation. Modelling of both the springs is done using ANSYS. Chrome silicon and music wire are chosen as a spring material. The responses like stress and deflection of helical spring and wave spring for both the materials under static loads of 3000 N, 3500 N, 4000 N is obtained. Further the dynamic analysis is conducted on both the springs under transient load conditions…
 

Development of Impact Force 1D Model for Powertrain Component

Denso-Yuma Yoshimaru, Makoto Kondo, Yukie Omuro, Masashi Inaba
Published 2019-06-05 by SAE International in United States
Electromagnetic valves excellent in sealing properties and resistant to sliding are often used in powertrain equipment installed in gasoline- or diesel-engine vehicles. An electromagnetic valve has the function of moving internal valve members by means of electromagnetic force generated by the application of a voltage and thereby changing the flow path. When an electromagnetic valve operates, however, the valve members impact with one another, emitting impact noise caused by it. With the requirement for low noise in electromagnetic valves having become stricter recently from the viewpoint of comfort in the passenger compartment, predicting the noise is needed at the design stage.With this background, this paper describes the development of a 1D model of impact force that will enable the noise and the product performance to be examined simultaneously for a GDI (gasoline direct injection) high pressure pump. In contrast to the conventional model in which a movable member is taken as a mass point with a spring and a damper placed at the impact section, this paper proposes a technique in which a spring-mass model…
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Cryogenic Cam Butterfly Valve

  • Magazine Article
  • TBMG-34596
Published 2019-06-01 by Tech Briefs Media Group in United States

Typical butterfly valves cannot seal at both ambient and cryogenic temperatures. At cryogenic temperatures, valves grow and shrink, changing critical dimensions such as distance between the disc and seat. Ideally, valves would compensate. The inability of existing butterfly valves to do this led to the design of the Cryogenic Cam Butterfly Valve (CCBV) in which the disc rides on a cam shaft and is held rigid by a torsion spring that provides both axial movement of the disc in addition to the standard 90-degree rotation of a standard butterfly valve. Because the valve’s disc can rotate and translate, it can hold a tighter seal, preventing leakage despite dimensional changes caused by changing operating temperatures.

 

Calculating the Estimated Fatigue Life of a Disc Spring

  • Magazine Article
  • TBMG-34573
Published 2019-06-01 by Tech Briefs Media Group in United States

In discussing fatigue life, it is important to distinguish between disc springs and conical spring washers, as they differ by design and intended usage. Conical spring washers are designed to provide a static thrust load in bolted joints and should not be used in fatigue applications; they are specified by DIN 6796.